PROFIBUS-PA Positioner Type 3785
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- Magdalene Meghan Gallagher
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1 PROFIBUS-PA Positioner Type 3785 Application Single-acting or double-acting PROFIBUS-PA positioner for attachment to pneumatic control valves. Rated travel from 7.5 to 120 mm Opening angle up to 120 Smart, bus-powered field device conforming to PROFIBUS-PA specifications based on IEC standard transmission technology. Automatic adjustment to valve and actuator. The microprocessor-controlled positioner ensures a preselected correspondence between the valve stem position and the control signal. It compares the digital control signal received from a control system via bus lines (cyclic transmission) to the travel of a control valve and produces the corresponding pneumatic output signal pressure. Suitable for attachment to both linear and rotary actuators. The Type 3785 PROFIBUS-PA Positioner communicates according to PROFIBUS-PA Profile Class B based on DIN EN and DIN Part 4, thus exchanging data with suitable programmable logic controllers, automation systems and various computer based configuration and operating tools. Positioners featuring digital data processing benefit from the following advantages compared to conventional positioners without such capabilities: Easy operation, automatic adjustment of zero and span during positioner initialization Automatic detection of faults in the actuator Direction of action selectable independent of the mounting position via software functions Configurable tight-closing function for both final positions Selectable characteristics Configurable with a PC over SSP serial interface using TROVIS-VIEW software Simple modification of control parameters, even when being operated Monitoring and diagnostic functions Continuous monitoring of the zero point Minimum air consumption Permanent storage of all parameters in non-volatile EEPROM (protection against power failure) Accessories The digital positioner s functions can be optionally extended through the following equipment: Two inductive limit switches (proximity switches) Forced fail-safe venting action which, upon absence of an external signal, vents air from the actuator via the 2/2-way on-off valve (Fig. 3, no. 4). As a result, the control valve moves to its fail-safe position. Fig. 1 Type 3785 PROFIBUS-PA Positioner Fig. 2 Type 3785 Positioner with open cover Associated Information Sheet T 8350 EN Edition June 2004 Data Sheet
2 Principle of operation The travel of the final control element is detected via the noncontact inductive travel sensor (1) and transmitted to the microcontroller (2) via converter. In the microcontroller, the travel is compared to the set point, and the two pneumatic 2/2-way on-off valves (3, 4) are activated whenever a deviation (error) occurs. Depending on the error, these valves either supply air to (3) or vent air from (4) the pneumatic actuator via corresponding boosters. A second microcontroller (5) manages digital data transmission according to PROFIBUS-PA Profile Class B definition. The positioner communicates and is powered via IEC standard transmission technology. LEDs integrated inside the positioner s cover signalize readiness for operation, control operation and any operational faults. A software package enables tuning and selection of all the required parameters which are downloaded to the PROFIBUS- PA positioner by the program. Frame applications that support the FDT/DTM technology according to specification 2.1 (e.g. PACTware) are suitable. Other integration options (e.g. in COMMUWIN II or PDM) are available. As a standard feature, the PROFIBUS-PA positioner comes with a binary input used to signalize additional messages. A write protection switch located on the inside of the cover prevents saved configurations from being overwritten unintentionally. Configuration with TROVIS-VIEW software The positioner must be connected to a DC voltage source for a reliable operating voltage supply, however, not an active bus segment. An additional digital interface exists on the positioner to configure it using SAMSON s TROVIS-VIEW software which is connected with to RS-232 port of a PC. The TROVIS-VIEW software enables the positioner to be adapted to the process requirements and the process to be monitored online. PROFIBUS-PA IEC 9 µc µc e p e p G G Interface TROVIS VIEW Legend 1 Inductive travel sensor 2 Microcontroller 3 On-off valve for supply air 4 On-off valve for venting air 5 Microcontroller 6 Microswitch for bus address and write protection 7 Binary input 8 Forced venting 9 IEC Interface module Fig. 3 Functional diagram of Type 3785 PROFIBUS-PA Positioner Fig. 4 Display of parameters by means of the COMMUWIN II program package 2
3 Table 1 Technical Data applying to Type 3785 Travel Attachment to Type 3277 Actuator Attach. acc. to DIN EN (NAMUR): Adjustable 5 to 30 mm 5 to 255 mm or 30 to 120 for rotary actuators Bus connection Fieldbus interface according to IEC Field device according to FISCO (Fieldbus intrinsically safe concept) Permissible operating voltage 9 to 32 V DC Static destruction limit 35 V Power supply via bus cable Maximum operating current 10 ma Maximum current in case of fault 0 ma Auxiliary power Supply air from 1.4 to 6 bar (20 to 90 psi) Output signal pressure 0 bar to pressure of supply air Characteristic Adjustable Linear Equal percentage Reverse equal percentage User programmable Deviation < 1 % Dead band (based on rated travel/angle) Adjustable from 0.1 to 10.0 % Default 0.5 % Resolution (internal measurement) < 0.05 % Transit time to travel Up to 240 s, separately adjustable for venting and supply air Moving direction Reversible Adjustment via software Air consumption Independent of supply air < 90 ln/h Air supply Actuator filled For p = 6 bar: 9.3 mn 3 /h For p = 1.4 bar: 3.5 mn 3 /h Actuator vented For p = 6 bar: 15.5 mn 3 /h For p = 1.4 bar: 5.8 mn 3 /h Permissible ambient temperature 40 to 80 C For explosion-protected devices, the limits in EC Type Examination Certificate additionally apply Effects Temperature 0.15 %/10 K Auxiliary power None Vibrations None up to 250 Hz and 4 g Explosion protection II 2 G EEx ia IIC/IIB T6 or II 2 D IP 65 T 80 C, other approvals on page 4 Degree of protection IP 65 by using supplied filter check valve Electromagnetic compatibility Requirements acc. to EN , EN and NAMUR recommendation 21 are met Binary input Internal power supply 5 V DC Ri approx. 100 kω for signaling function Weight Approx. 1.3 kg Communication Data transmission According to PROFIBUS-PA Profile Class B according to EN and DIN Part 4 Communication (local) SAMSON SSP interface and serial interface adapter Software requirements TROVIS-VIEW with database module 3785 Communication over fieldbus DTM file according to specification 1.2, suitable for integrating the positioner into frame applications that support the FDT/DTM concept (e.g. PACTware) other integrations (e.g. in COMMUWIN II or PDM) are available Accessory equipment Inductive limit switches For connection to a NAMUR signal converter according to EN Two Type SJ2-SN Proximity switches Forced venting Input Kv value Activated over internal switch 6 to 24 V DC Ri approx. 6 kω at 24 V DC (depending on voltage) Switching point for 1 signal at 3 V Switching point for 0 signal at 0 V 0.17 Table 2 Materials Case Die-cast aluminum, chromized and plastic-coated External parts Stainless steel and
4 Table 3 Summary of explosion protection certificates for Type 3785 Certificate type Certificate number Date Comments EC Type Examination Certificate First Addendum Second Addendum Third Addendum FMRC Certificate PTB 97 ATEX J.I ID CSA Certificate II 2 G EEx ia IIC T6 (3.3-V version) with programming connector II 2 D IP 65 T 80 C Cl. I, II, III; Div 1; Groups A, B, C, D, E, F, G; NEMA 4 X Cl. I, Zone 0, AEx ia IIC T6; Cl. I, Div. 2, Gr. A, B, C, D Class I, Div. 1; Gr. A, B, C, D; Cl. I, Zone 0, Ex ia IIC T6, Type 4 Enclosure/ Rev. logic board GOST Certificate 2002.C Ex ia IIC T6, valid until The EC Type Examination Certificate is contained in the Mounting and Operating Instructions or is available on request. Controller/PLC/ Control system (Master Class 1) Segment coupler Termination Display and operating element (Master Class 2) PROFIBUS-PA IEC Termination Fig. 5 PROFIBUS connection of the Type 3785 Positioner Controller/PLC/ Control system (Master Class 1) Intrinsically safe segment coupler Termination Display and operating element (Master Class 2) Non-hazardous area PROFIBUS-PA IEC Hazardous area Fig. 6 Connection of the Type Positioner in hazardous areas 4
5 Connecting the PROFIBUS-PA Positioner The Type 3785 PROFIBUS-PA Positioner must be connected to bus segments conforming to IEC standard. Power supply as well as data communication take place via a shielded or unshielded two-wire cable. A segment coupler serves to provide the individual PROFIBUS-PA segments with energy. If PROFIBUS-PA segments are used in hazardous areas, explosion-protected segment couplers must be used. Electrical connection Bus line IEC PE S NC PROFIBUS-PA *) Switching amplifier acc. to EN for proximity switches GW2 Limit switches *) Capacitive grounding of the shield GW1 Binary input V DC Forced fail-safe ventingaction Fig. 7 Electrical connection of Type 3785 with accessories Attaching the digital positioner The digital Type 3785 Positioner can be mounted directly to the Type 3277 Pneumatic Actuator using a connection block. For actuator versions with fail-safe action Actuator stem "extends" and Type (120 cm 2 ), the signal pressure is internally introduced to the diaphragm chamber through a hole integrated into the actuator yoke. For actuator versions with failsafe action Actuator stem "retracts" and for actuators with effective areas of 240 cm 2 or more, the signal pressure is introduced to the diaphragm chamber over ready-made external piping. An adapter plate allows the positioner to be attached to either side of the control valve according to DIN EN (NAMUR recommendation). Attachment to the Type 3278 Pneumatic Rotary Actuator or other rotary-motion actuators according to VDI/VDE 3845 requires an intermediate piece. The rotary motion of the actuator is converted into a linear motion via a cam disc. This cam disc is designed for an angle of either 0 to 90 or 0 to 120. The characteristic can be selected via software. For double-acting springless actuators, a reversing amplifier is required for the second opposed signal pressure. Nomenclature for ordering Positioner Type x x x x x 3 x Explosion protection Without 0 II 2 G EEx ia IIC T6 ATEX 1 II 2 D IP 65 T 80 C ATEX EEx ia CSA/FM 3 Accessories Limit switches Without 0 2 inductive 2 2 Forced fail-safe venting action Without 0 With 1 2 PA device Version profile Version Pneumatic connections NPT ISO 228/1 - G Electrical connections Cable gland M20 x 1.5 with shielding, nickel-pl. brass Number: Ordering text PROFIBUS-PA Positioner Type (see above) Pressure gauge for Without/with indicating signal pressure For positioners with limit switches: Metal tag in final position of the valve outside active zone Metal tag in final position of the valve inside active zone Attachment to Type 3277: Actuator sizes 120/240/350/700 cm 2, Fail-safe action: Actuator stem "Extends"/"retracts" Attachment according to DIN EN (NAMUR) Travel:... mm Stem diameter:... mm (if applicable) If applicable, signal pressure restriction for actuators with small travel volumes. Attachment to rotary actuators: Type 3278, sizes 160/320 cm 2 Attachment to single-acting/double-acting rotary actuators according to VDI/VDE If applicable, signal pressure restriction for actuators with small travel volumes. Accessories: Adapter NPT 1/2 for electrical connections 5
6 Dimensions in mm Specifications subject to change without notice. 14 Direct attachment to Type 3277 Pneumatic Actuator Output (36) 28 Supply (9) Pg Attachment according to DIN EN and NAMUR 39 N1=113 N2=200 Output1 (A1) 28.5 Supply (Z) Output2 (A2) Fulcrum Attachment to rotary actuators Reversing amplifier (optional) SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße Frankfurt am Main Germany Phone Fax Internet:
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